take it to an auto electrician, the problem sounds like some faulty wiring or a bridge on the pcb
It could mean: 1. Ignition is off / engine is stopped 2. Fuse of dashboard is damaged 3. Problems with wire
There are certain car gauges which are mandatory to have in a dashboard. These gauges are the speedometer, the temperature gauge, the fuel gauge, the tachometer, oil pressure gauge, charging system gauge, and odometer.
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It is quite possible in a 1996 Mercury Cougar, that when the dashboard instruments all quit at once, there is a fuse that has been blown. Most of the gauges in the dash run off the same fuse in most vehicles.
Fuel, coolant, voltage
Fuel, coolant, voltage
Fuel, coolant, voltage
check the fuse panel and the fuses
Check for a blown fuse.
It's that part in front of the driver with the lights and gauges, radio, glove compartment, etc.
Lights don't go to "zero". Indicators possibly. This could also be part of the normal start-up routine where the gauges themselves may do this ... called a self-check of systems.
Faulty wiring, faulty CECU.